Stoker



F. P. ROESCH STOKER Filed Aug. 5, 1924 June 26, 1928.

Patented June 26, 1928.

UNITED STATES 1,614,994 PATENT OFFICE.

FRANK P. BOESCH, OF CHICAGO. ILLINOIS, ASSIGNOB TO STANDARD srom COMPANY, A CORPORATION OF DELAWARE.

STOKEB.

Application filed August 5, 1924. Serial Ito. 780,189.

This invention relates to stokers of the type wherein coal is delivered through a tube or conduit to the combustion chamber at a point above the fire and is distributed over the fire by jets of steam and other propelling fluid. The invention relates particularly to an improved means for distributing the coal over the tire and to an improved means for supplying and regulating the supply of fluid to said jets.

One objectof my invention is to provide an improved means for distributing fuel over the fire by means of jets which will impart to the fuel a downwardly inclined motion so as to prevent the rising gases from the fire from carrying the finer particles of fuel out of the combustion chamber.

A further object is to provide an improved arrangement of supply pipes for conducting fluid to the distributing jets m such a manner as to avoid undue exposure of the pipes to the heat of the fire box and to absorb vibration and expansion and contraction tending to cause the pipes to break or become leaky.

Other ob'ects and advantages of my invention wili appear from the following de= scription taken in connection with the accompanying drawing which shows one embodiment of my invention, wherein:

Fig. 1 is a fragmentary sectional view through a portion of a fire box showing a part of the conveyor for carrying fuel into the fire box, and a jet distributing means.

Fig. 2 is a plan view partly broken away of the structure shown in Fi 1.

Fig. 3 is an enlarged detai view partly broken away showing the up r and of the fuel delivery conduit and t e distributor head.

Fig. 4 is a sectional view taken on the line 44 of Fig. 1.

Referring to Fig. 1, re resents a support which may be the main rame of a locomotive, and 11 represents a portion of the rear water wall or back head of the boiler with the mud ring 12 extending along the lower part thereof. 13 represents a fuel conveyor comprising a horizontal conduit 14 and a vertical conduit 15 which is adapted to receive coal from the horizontal conduit and which extends upwardly through the main grate 16 of the fire box to a delivery opening 17. The vertical conduit 15 is mounted on the frame 10 and each conduit is provided with a conveyor screw adapted to be rotated by any suitable means to force the fuel through the conduits to the delivery opening. As shown in Fig. 1, the screw in the vertical conduit termmates somewhat below the deliver opening.

The portion 0 the vertical conduit 15 above the main grate is protected from excessive heat by a rotecting grate 20 surrounding, or partially surrounding, the conduit and terminating in an upper surface 20' adjacent the delivery opening 17. The protective grate 20 is preferably provided with slots 21 for the passage of air into the combustion chamber. the air being led to the interior of the grate 20 from below through an opening 22 in the rear of the main grate. An insulating air space is thus provided between the conduit and the protecting grate, 1

further protecting the conduit from excessive heat.

25 represents a distributor head preferably of integral cast hollow construction which is mounted at the rear of the combustion chamber and extends over the delivery opening 17. The distributor head 25 is formed with jet openings 26 distributed over the side walls thereof in osition'to command the entire grate area of t e combustion chamber. These openings are preferably inclined downwardly so that. the jets of steam issuing therefrom will be dis osed in such position that the fuel will be istributed evenly over and downwardly on the fire bed, thus opposing the action of the draught which tends to drive the smaller particles of fuel into and through the boiler tubes. Steam or air under pressure is supplied to the distributor head. issuing forcibly in jets from the o n ings 26 in such a manner that fuel lifte up through the conduit 15 will be ually distributed over the entire fire bed 0 the combustion chamber.

For supplying fluid under pressure to the distributor ead, a plurality of pipes 30 extend froix a manifold 31 on the outer face of the water wall 11, each pipe being preferably manually controlled by means of a valve 32. Each steam pipe 30 preferably leads to an opening or openings 26 separated from the other openings, as shown in Fig. 4, so that the distributing ca acity of the steam issuing from the indivi ual et openings may be regulated and the distribution of fuel to various parts of the combustion III) chamber thus controlled. As shown in Fig. 1, the steam supply pipes are bowed downwardly under the mud ring 12 forming downwardly extending loops and forming flexible pipe connections resulting in reducing the loose joints, breakage and accidental leaks in the pipe connections. The forward legs of the supply pipes lying between the water wall 11 and the conduit 15 and between the two sides of the protective grate 20 are thus advantageously protected from exposure to the extreme heat of the combustion chamber.

I claim:

1. In a locomotive stoker a conveyor for elevatin fuel into the combustion chamber, an auxiliary grate in said combustion chamber arran ed about the upper end of said conveyor or rotecting the same from heat, a distributor ead mounted on the delivery end of said conveyor within the combustion chamber, jet forming means carried by said head and comprisin a jet opening above the upper end of said conveyor inclined so as to direct its jet as a whole with a downward inclination in a direction having a component op ite to the rising direction of the gases m the fire to which the fuel is bein fed, and connections for conducting flui under pressure to said distributor head.

2. In a locomotive stoker a conveyor for elevating fuel into the combustion chamber, an auxiliary grate in said combustion chamber arranged about the upper end of said conveyor for protecting the same from heat, a distributor head mounted on and extending over and above the delivery end of said conveyor, jet forming means carried by said head and comprising jet openings above the upper end of said conveyor spaced to direct the jets to all portions of the combustion chamber, said jets being inclined so as to direct each jet as a whole with a downward inclination in a direction having a com nent o posite to the direction of the rising gases rom the fire to which the fuel is being fed, and connections for conducting fluid under pressure to said distributor head.

3. In a locomotive stoker a conve or for elevating fuel into the combustion c amber comprising a vertical conduit terminating in a delivery opening, and an elevatin screw in said conduit terminating below sai delivery opening, an auxiliar grate in said combustion chamber arrange about the upper end of said conduit for protecting the same from heat, a distributor head contiguous to the rear of said delivery 0 ning and above the level thereof, said distri utor head having downwardly inclined jet openings distributed around said head formin downward inclined jets to feed the fuel orward and distribute it to the various parts of said combustion chamber, and connections for conducting fluid under pressure to said dis- .3

tributor head.

FRANK P. ROESCH. 

